Currently the Worst AA in the game, 10 points can add an awesome 250 Mitigation (it goes down alot when you add more points into it), Currently the character sheet adds 750 Mitigation... this is NOT in line with the current content or game.
Please change it to 1% Damage Reduction or Minus 5-50 (scale) to all damage per point spent.
P.S. It would also be nice if you changed the Damage Per Second Above it to Autoattack Modifier.